【摘要】：對于水下發(fā)射過程來說,掌握水動力載荷形成機理與結構響應特征是一個亟待解決的問題.研究該問題需要考慮含相變的復雜多相流動,變約束的結構運動以及這二者之間的耦合效應.本文采用松耦合的方法,以流體求解器為主體,將自編的固體結構程序接入流體求解器中,在每個時間步長內分別對流體動力學方程和固體結構動力學方程進行求解,通過流固界面之間的數(shù)據(jù)交換實現(xiàn)耦合計算.其中,流體求解器基于雷諾平均納維斯托克斯方程,采用單流體模型處理多相流問題,引入空化模型描述空化相變,采用修正的湍流模型模擬混合物的湍流效應,并采用動網(wǎng)格技術處理移動邊界問題.航行體的剛體運動和結構振動分開求解.結構求解器采用等效梁模型描述結構的振動,通過坐標變換給出了隨體坐標系下的結構振動方程,求解方法采用時域積分法.所建立的流固耦合方法不僅能夠捕捉到自然空化的演化情況,還可獲得航行體所受水動力、結構振動響應以及截面的彎矩,獲得了實驗的驗證.基于該方法研究了結構剛度、發(fā)射速度對空泡潰滅與結構振動耦合效應的影響規(guī)律.結果表明,同步潰滅是影響結構載荷的主要因素,包括潰滅壓力幅值,潰滅壓力作用位置,以及潰滅壓力與結構振動的相位關系.
[Abstract]:For underwater launch process, mastering the formation mechanism of hydrodynamic load and structural response characteristics is an urgent problem to be solved. In order to study this problem, it is necessary to consider the complex multiphase flow with phase transition, the structural motion with variable constraints and the coupling effect between the two. In this paper, with the fluid solver as the main body, the self-designed solid structure program is connected into the fluid solver by using the loose coupling method, and the hydrodynamic equation and the solid structure dynamic equation are solved respectively in each time step. Coupling calculation is realized by data exchange between fluid-solid interfaces. The fluid solver is based on the Reynolds average Neville equation, uses a single fluid model to deal with the multiphase flow problem, introduces the cavitation model to describe the cavitation phase transition, and uses the modified turbulence model to simulate the turbulent effect of the mixture. The moving grid technology is used to deal with the moving boundary problem. The rigid body motion and structural vibration of the navigational body are solved separately. The equivalent beam model is used to describe the vibration of the structure. The vibration equation of the structure in the body coordinate system is given by coordinate transformation. The time domain integration method is used to solve the problem. The fluid-solid coupling method can not only capture the evolution of natural cavitation, but also obtain the hydrodynamic force, structural vibration response and section bending moment of the navigational body, which is verified by experiments. Based on this method, the effects of structural stiffness and emission velocity on the coupling effect of cavitation collapse and structural vibration are studied. The results show that synchronous collapse is the main factor affecting the structural load, including the amplitude of collapse pressure, the position of collapse pressure, and the phase relationship between collapse pressure and structural vibration.
【作者單位】： 中國科學院力學研究所流固耦合系統(tǒng)力學重點實驗室;中國科學院大學工程科學學院;
【基金】：國家自然科學基金資助項目(11402276)
【分類號】：O353.4

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